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A rule of thumb I use with Poly or Vinyl is 5 cc MEKP per half liter. 10cc if using tooling gelcoat.
You really don’t need to be super accurate with poly or vinyl because they only need catalyst to speed up the cure rate. Poly will cure on its own without MEKP (in like 100 years).
If you mess up and your part is not curing move it to a hot room, and last ditch effort put it out in the sun.
Jason
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